LIVE NEWS and UPDATES

03:20 (IST)

That's it! A day of heartbreaks and sadness but also a day of new world champions. France's Kevin Mayer and Germany's Johannes Vetter won their first ever gold medals in the decathlon and javelin throw events. We also saw Maria Lasitskene successfully defend her title in the women's high jump event. Allyson Felix led the USA women's 4x100m relay team to victory while Sally Pearson added the World Championship title to her 2012 London Olympic gold in the 100m hurdles. It wasn't meant to be for Sir Mo Farah and Usain Bolt as they both failed to win in the last races of their careers finishing second and limping out respectively. The duo though will always be remembered as the greatest athletes ever.

03:03 (IST)

This was not how anyone had imagined Usain Bolt's career to come to an end. The world's fastest man ever exited the stage limping and grimacing as the whole stadium went crazy after seeing the home team Great Britain win gold, defying all odds and expectations. Usain Bolt, the greatest athlete of the modern era had the most anti-climatic end to his career. On a day which had seen Mo Farah, another legend, fail to win the 5,000m event, Bolt's heartbreaking exit, dashed the hopes of fans around the world who had hoped to see the Jamaican bow out with another gold in his kitty. Sadly, however, Bolt departs the sporting world broken and beaten.

02:47 (IST)

Great Britain win the men's 4x100m as Usain Bolt injures himself as Jamaica fail to finish the race

Bolt came pulled up with an injury halfway down the straight, dropping the baton before collapsing on the track. The greatest athlete of all time crosses the finish line limping with the support of his teammates.

Nethaneel Mitchell-Blake brought the baton home 37.47 ahead of the US last leg runner Christian Coleman. The USA clinch silver with a timing of 37.52 seconds, with Japan in 38.04 winning bronze.

Tori Bowie, the individual 100m champion anchors the United States in the women's 4x100m final in 41.82sec, the fastest run this season, with Britain clinching silver in 42.12 ahead of Jamaica who win bronze in 42.19.

Germany's Johannes Vetter, who finished fourth in the Rio Olympics in 2016, wins the men's javelin throw after throwing a distance of 89.89m. The Czech Republic's Jakub Vadlejch wins silver with a personal best of 89.73m with compatriot Petr Frydrych winning bronze with a throw of 88.32m. India's Davinder Singh Kang finishes in 12th place.

France's Kevin Mayer adds a World Championship gold to the Olympic silver he won in Rio last year with a score of 8768 points. He ensured his crown by finishing eighth in the last event in the decathlon, the 1,500m race. Rico Freimuth of Germany with 8564 takes the silver with the bronze going to his compatriot Kaz Kazmirek with a season's best of 8488.

Maria Lasitskene has successfully defended her title with the Russian athlete competing as a neutral jumping a height of 2.03m before unsuccessfully attempting to clear 2.06m. Ukraine's Yulia Levchenko cleared her personal best of 2.01m with Poland's Kamila Licwinko clearing 1.99 to clinch bronze.

Edris holds of Mo Farah's late charge to win gold on the legendary Briton's final race. Edris does Farah's traditional celebration, the 'Mobot" as Farah collapses to the ground after crossing the finish line in disbelief as he fails to complete the 5,000m/10,000m double. The crowd though applauds one of Britain's most decorated athlete as he congratulates Edris.

01:07 (IST)

India's Davinder Singh is in action in the final of the men's javelin throw event. The Asian Championship bronze medalist begins with a throw of 75.40 and is in 12th place. The German favourite Johannes Vetter leads with a mammoth throw of 89.89 metres.

00:58 (IST)

Sir Mo Farah is on the track as he aims to achieve an unprecedented fifth global double (5,000/10,000 metres). The Ethiopian trio of Muktar Edris, Yomif Kejelcha and Selemon Barega will be aiming to spoil Farah's party.

The London Olympic gold medalist beats the challenge from Beijing Olympic championDawn Harper Nelson to blaze to victory in 12.57 seconds. Nelson, in 12.63 seconds finishes ahead of Germany's Pamela Dutkiewicz who wins bronze with a timing of 12.72 seconds.

World record holder Kendra Harrison hit the third hurdle and finishes in fourth place.

00:36 (IST)

USA's Kendra Harrison and Australia's Sally Pearson go into the women's 100 metres hurdles as favourites to win the event. Harrison, the World Record holder will be aiming to bag her maiden World Championships gold. London Olympics gold medalist Pearson stormed into the finals with a timing of 12.53 seconds. Expect a thrilling race between the two.

00:29 (IST)

With just one event to go, the 1500m, Kevin Mayer continues to lead the #IAAFworlds decathlon

Janek Oiglane of Estonia threw the javelin out to a personal best distance of 71.73m and took the lead in the Group B of throwers taking part in the penultimate decathlon event.

Kevin Mayer, France's Rio 2016 silver medallist, threw a distance of 66.10m as he reclaimed his overall lead going into the 1,500m event, the final event in the men's decathlon.

23:38 (IST)

We are underway in the women's high jump final where Russia's Maria Lasitskene competing as a neutral athlete, Lithuania's Airine Palsyte Spain's Ruth Beitia and Poland's Kamila Licwinko go head to head. Also in the contention are the US pair of Inika McPherson and 18-year old Vashti Cunningham and Britain's Katarina Johnson-Thompson, who receives a rousing welcome from the home crowd as she is introduced before the final.

22:56 (IST)

At the end of Group A's javelin throw event of the men's decathlon, Czech Republic's Adam Sebastian Helcelet moves into the lead as his throw of 71.56m earns him 913 points with Britain's Ashley Grant second in Group A with a throw of 67.97m. France's Kevin Mayer can reclaim the lead when he takes to the field in Group B's javelin throw. It will all boil down to the 1,500m race which will take place at 1.15 IST, just before the women and men's 4x100 relay events.

22:12 (IST)

Good evening and welcome to Firstpost's live coverage of the IAAF World Athletics Championships 2017 Day 9's second session. Tonight the world will see two sporting legends bid adieu to. Usain Bolt is in contention for a gold as he participates in the men's 4x100 metres relay with Jamaica after he missed out on a gold to the USA's Justin Gatlin in the 100 metres event. Will we see Bolt bow out on a high or will Gatlin spoil Bolt's farewell race with another gold with the USA? Sir Mo Farah will also run his last race in the men's 5,000 metres final where he is favourite to win and he'll be eager to add a gold after winning one in the 10,000 metres event earlier in the week. Stay tuned for all the action live from London.

19:26 (IST)

While the world record has disappeared out of view, Mayer is still marching on to the title.

19:14 (IST)

Never mind the world record but Kevin Mayer from France came perilously close to nosediving down the decathlon leaderboard after needing three attempts at his opening height of 5.10m.

18:03 (IST)

Hero, the hedgehog, the Championships mascot, has been one of the off-track highlights

Kevin Mayer has retained his overall lead in the decathlon after going out to 47.14m but Germany's Rico Freimuth has cut into the Frenchman's lead after surpassing the 50m line in the discus with 51.17m. Just 24 points separate them - 6296 and 6272 - but Mayer can far outperform Freimuth in the next three events.

17:37 (IST)

This is how the athletes fare after seven events of decathlon

17:25 (IST)

After seven events of the decathlon France's Kevin Mayer holds on to a slender 24-point lead over Germany's Rico Freimuth. The next event in the decathlon is the pole vault which will bring the afternoon session to its closing.

17:16 (IST)

In the men's discus throw (decathlon), a bronze medallist two years ago, Rico Freimuth from Germany has just gone out to 51.17m in the second round of the decathlon discus. That translates to 895 points and takes his rolling total up to 6272, just behind Kevin Mayer with 6296 points.

16:48 (IST)

The top five finishers in the second heat of the 4x400m were all faster than the first heat winners. The United States progressed through in a world-lead of 2:59.23 ahead of Trinidad & Tobago (2:59.35) while a triumvirate of Borlees helped Belgium into the final with 2:59.47. Despite the chants of 'Roo-ney' echoing around the arena on the last lap, the British team with Martyn Rooney on anchor dropped back to fourth but still qualified on time with 3:00.10 along with France (3:00.92).

Botswana were tipped by many for a medal before the championships but a disastrous changeover between Nijel Amos and Karabo Sibanda put paid to their already slim chances of qualifying. They trailed in sixth in 3:06.50, one place ahead of Japan in 3:07.29. Other noteworthy non-qualifiers were Jamaica and the Bahamas - Olympic champions in this arena five years ago - from the first heat.

16:42 (IST)

In the decathlon discus throw event, France's Kevin Mayer recorded a best of 47.14m and then drifted off pace, the Olympic silver medallist could still surpass the 9000-barrier if he equals his lifetime bests in the final three events.

16:42 (IST)

#TeamUSATF makes it 4️⃣ wins and 4️⃣ world leads in relay heats this AM. Men’s 4x4 FTW in a WL 2:59.23! #IAAFWorlds

Samuel Garcia was treading water in the last 50 metres but the Spaniards hold on for the first heat win in the 4x400m in 3:01.72 ahead of Poland (3:01.78), Cuba (3:01.88) and Jamaica (3:01.98).

16:27 (IST)

The Indians put up a valiant fight but settle for the fifth place as Spain, Poland and Cuba make it to the top 3 to gain an automatic qualification. Jamaica will wait for Heat 2 results to see if they qualify for the men's 4x400 m relay final

Preview: Usain Bolt, the superstar who made athletics fun and watchable for the past decade returns to the track for the final time Saturday to run on Jamaica's 4x100-meter relay team. Mo Farah will also be in action on the penultimate day of the championships in his swansong race, the men's 5,000 metres.

The rest of the six events of the decathlon will take place with the 1,500 metres bringing to close the multi-discipline event.

Jamaica will be competing with their historic rival, United States of America in both men's and women's 4x100 metres relay finals.

The women's high jump, the other gold medal event, where Russian athlete Maria Lasitskene, competing under the Authorized Neutral Athlete category, is the strongest contender.

In the women's 100 metres hurdles, it will be a two-horse race with former 100 metres hurdles champion Sally Pearson of Australia going up against world record holder Kendra Harrison of the US for the title. A victory for Sally Pearson would find Australia a place in the medal tally.

While the Indian relay teams will be in action in the men's and women's 4x400 metres event, Davinder Singh Kang, who became the first Indian to qualify for the men's javelin final event at the worlds will be other Indian in the fray.

Your guide to the latest seat tally, live updates, analysis and list of winners for Lok Sabha Elections 2019 on firstpost.com/elections. Follow us on Twitter and Instagram or like our Instagram or like our Facebook page for updates from all 542 constituencies on counting day of the general elections.